Just like all Pokemon sets, there are a fair few cards that aren't worth all that much, but on average, cards from the 1st edition release sell for a hefty sum
[c]Cleric of Chill Depths[/c], [c]Bind the Monster[/c], [c]Entrancing Lyre[/c], and [c]Kor Hookmaster[/c] are all cards that tap a creature for two turns
I could easily imagine moving it to the maindeck, and depending on the shape of the format, its not even clear we couldnt play multiples
1 foil promo card featuring Mimikyu ex
According to the official Pokmon TCG Tournament Rules, all cards in a deck must not be marked or altered in any way. This includes marked cards, which are obviously illegal because of cheating, but also "cards that have undergone post-production alteration